ASSESSMENT TECHNIQUES OF CABLE WEAR RISK IN WELLBORE

Cable failure often occurs when the production string runs into an inclined wellbore. A finite element model for the string stress is proposed. A clearance unit is introduced to resolve the contact force and contact position between string and wellbore.By the cable wear risk assessment,combined with the drilling rigs heading, a reasonable riding position of cable when running into the well is calculated, which reduces wearrisk. According to our analysis, the upper part of the string contacts with the higher edgeor side edge of wellbore, while the lower part contacts with the lower edgeor the side edge of the wellbore. The reliability of the evaluation method is testified,and the analysis result can be used for reference when riding the cable in field operations.